Installation failure: imagemagick +rsvg

[rhstanton]

With a fresh installation of MacPorts under High Sierra, I tried

sudo port install imagemagick +rsvg

This goes on for a while, installing dependencies, before it crashes with the error

Error: Processing of port imagemagick failed

When I try the command again, I get the same result, but only a small list of remaining dependencies, so I assume the error may be in one of these:

$ sudo port install imagemagick +rsvg

---> Computing dependencies for ImageMagick

The following dependencies will be installed:

graphviz

librsvg

vala

Continue? [Y/n]: y

Error: Follow ​https://guide.macports.org/#project.tickets to report a bug.

Error: Processing of port imagemagick failed